[PATCH 4.19 regression fix 1/2] staging: vboxvideo: Fix IRQs no longer working

[Nicholas Mc Guire]

On Mon, Sep 10, 2018 at 08:30:38PM +0200, Hans de Goede wrote:
> Commit 1daddbc8dec5 ("staging: vboxvideo: Update driver to use
> drm_dev_register.") replaced the obsolere drm_get_pci_dev() with
> normal pci probe and remove functions.
> 
> But the new vbox_pci_probe() is missing a pci_enable_device() call,
> causing interrupts to not be delivered. This causes resizes of the
> vm window to not get seen by the drm/kms code.
> 
> This commit adds the missing pci_enable_device() call, fixing this.

pci_enable_device is the wrapper to pci_enable_device_flags() the later
return < 0 on error - so while the check for if(ret) will do the right
think here I think it would be prefereable to explicidly use if (ret < 0)
as all error values pci_enable_device_flags() returns are negative.

> 
> Fixes: 1daddbc8dec5 ("staging: vboxvideo: Update driver to use ...")
> Cc: Fabio Rafael da Rosa <fdr at pid42.net>
> Cc: Nicholas Mc Guire <der.herr at hofr.at>
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
Reviewed-by: Nicholas Mc Guire <der.herr at hofr.at>

> ---
>  drivers/staging/vboxvideo/vbox_drv.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/staging/vboxvideo/vbox_drv.c b/drivers/staging/vboxvideo/vbox_drv.c
> index da92c493f157..69cc508af1bc 100644
> --- a/drivers/staging/vboxvideo/vbox_drv.c
> +++ b/drivers/staging/vboxvideo/vbox_drv.c
> @@ -59,6 +59,11 @@ static int vbox_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>  		ret = PTR_ERR(dev);
>  		goto err_drv_alloc;
>  	}
> +
> +	ret = pci_enable_device(pdev);
> +	if (ret)
> +		goto err_pci_enable;
> +
>  	dev->pdev = pdev;
>  	pci_set_drvdata(pdev, dev);
>  
> @@ -75,6 +80,8 @@ static int vbox_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>   err_drv_dev_register:
>  	vbox_driver_unload(dev);
>   err_vbox_driver_load:
> +	pci_disable_device(pdev);
> + err_pci_enable:
>  	drm_dev_put(dev);
>   err_drv_alloc:
>  	return ret;
> -- 
> 2.19.0.rc0
>